Gil is pretty good and I'm glad that he doesn't get personal because that would just undermine his authority. I think he could've done a better job providing evidence against what Knobbe said.
Knobbe wasn't always using epidemiological research, which has been denigrated a lot by influencers as being invalid science when a great deal of science is based on what is found with epidemiology, especially in cases where actual experimentation would be unethical; I wouldn't dismiss it. Some of the things that Knobbe said were sheer ignorance, non-sequiturs and other false logic, and that makes him either an ignorant fool or a shill. I can imagine that, even though he's a doctor, he may not have the skills and intelligences necessary to correctly understand data.
I'm glad the video has helped to point you in the right direction.